Pump piston or plunger



Jan, 6, 1925.

S. E. CLINE PUMP PIsToN 0R PLUNGER 2 sheets-sheet 1 Filed Sept. 29, 1923 FIG.

FIG. 2.

Jan, 6, 1925.

' s. E. CLINE PUMP PIsToN 0R PLUNGER 2 Sheets-Sheet 2 l 3111x211* o@ 5. E. CL/NE,

Patented Jan. 5, 1925.,

unirse stares ea'rsur ermee.

SANFORD E. CLINE, OF GBEENSBUR-G, LOUISIANA., ASSIGNOR OF'vO-NE-HALEE TO F. M; THOMSON, OF INDIANAPOLIS, INDIANA'.

PUMP PSTON OR IPLUNGER.

enable others skilled in the art to which itY appertains to make and use the same.

The present invention relates to pistons or plungers, especially those used in pump cylinders, and aims to provide a pump piston or sucker provided with novel and improved packer means of metal or other suitable material, which will have a longer life than leather, rubber and similar packers as now used, and to provide for greater efficiency and less annoyance, it being well known that the leather, rubber and similar packers wear out quickly, especially when subject to constant or hard use.

Another object of the invention is the provision of such metal or similar packer means having sections so assembled that the movement oi thel piston orY plunger in one direction (usually downward) is free and easy, with minimum friction between the piston and cylinder, and whereby said sections are caused to snugly fit the cylinder when the piston moves in the oppo-` site direction so as to prevent leakage between the piston an-d cylinder.

A further object is the provision of a' piston or plunger of the kind indicated, wherein the packer means will also provide a valve permitting the flow ot the liquid past the piston when it moves in one'direction, or downwardly, so that the packer and valve comprise a single device, one section of the packer providing the valve.

lith the forego-ing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made' within the scope 'of fwhat is claimed, without de-` parting from the spirit of the invention.

The invention is illustrated in the accom'- panying drawings, wherein-e Figure 1 is a side elevation of the im- Applcation led September 29, 1923. Serial No. 665,581.

proved pump piston, showing the cylinder in section.

Fig. 2 is a plan view of the piston.

Fig. 3 is a vertical section on the line 3-3 of Fig. 2.

Fig. 4 is an elevation of one part or section of the piston.

Fig. 5 is an elevation of the other part or section of the piston.

Fig. 6 is aside elevation sho-wing the improvement incorporated in a modified way, in an ordinary pump piston or sucker.

Fig. 7 is a section on the line 7-7 of Fig. 6.

Fig. Fig. 6.

Fig. 9 is an elevation of one section of theV packer of the device shown'in Figs. 6, 7 and 8. v

1n' kthe construction shown inFigs. 1 to 5, inclusive, 'the piston is' not of the conventional form, as shown in Figs. 6 to 9, inclusive, but comprises a disk 7 having the marginal offset portionor step 8. As shown,y the portion 8 extends upwardly, which is the arrangement when the piston is used in a vertical pump cylinder for lifting or raising the water or other liquid therein.

rlhe lower end of the pump or sucker rod 11l is attached tothe piston in any suitable manner, and as shown, the lower end of the rod is screw-threaded into the disk 7 at the center thereof, and Va lock nut 9 is threaded on the rod and bears against the disk 7, with the lortion 8 surrounding and spaced 'from sai nut.

The packer means of the piston includes the cylindrical rim or packer portion 14 extending from the edge of the portion 8,

8 is a section on the line 8-8 of and projecting upwardly, as shown, or in the same direction from the disk 7 as the pertion 8 and packer er' rire portion 14,' is

Cil

divided into two sections 12 and 21, with the division 16 being.;- disposed in a single oblique or inclined plane intersecting the axis of the piston intermediate the planes of the disk 7 and edge of the portion 14:. The two sections of the `piston are arcuate with their adjacent ends out obliquely to abut and overlap, as seen in Figs. 1 and 3. By this arrangement, with the pump rod 11 secured to the section 21 ot the piston, the section 12 is free from said rod, and is capable of longitudinal movement relatively tothe rod 11 and section 21. Consequently, when the piston moves downward, the section 12 can be displaced upwardly relatively to the section 21, as sho-wn in broken lines in Fig. 1, to permit the liquid to pass, and said section 12 therefore provides the valve of the piston, without requiring a separate or additional valve.

When the rod 11 is moved upwardly, the valve section 12 of the'piston will settle down on the inclined surface 16 of the section 21, and the pressure of the head ofv liquid on the section 12 will force it with a wedge fit between the section 21 and the wall of the cylinder, the inclined surface 16 of the section 21 shifting the section 12 toward and against the cylinder wall when the section 12 moves downwardly relatively to the section 21, with a cam action between the sections. ./-ls a result, the two sections willbe broughtinto registration, and the cam action between them will cause the scc tions to tightly fit the cylinder wall when the piston is raised, thereby providing the packer means to prevent leakage between the Vpiston and cylinder.

ln order to limit the displacement of the valve section 12, a stop 10 is carried by the rod 11 above the disk 7, and, as shown, is of circular form, and has the arms or spokes 17 radiating from a hub 18 screw-threaded on the rod, with the outer ends of said arms or spokes connected to an annular rim or ring' 19. lock nut 20 is threaded on the rod and bears against the hub 18 to main@ tain the Vadjustment of the stop 10., which is disposed within and surrounded by the nackerportion 14, spaced from the shoulder 15 with the sections 12 and 21 in registering position. When the valve section 12 is moved to open position, as seen in broken lines in Fie. 1, the shoulder V15 of the section 12 will strike the stop 10, thereby limiting: the separation of the sections, and

keepin@ the section 12 in a position so that it will'A quickly move back to closed position when lthe piston is reversed and moved upwardly.V l y lVith such construction, although the piS ton is divided orV split into two parts, it combines therewith as an integral unit, the packer means and valve without separate valve and packer being required. The construction is not only capable of enduri considerable wear and hard usage, but is also simple and inexpensive to manufacture, there being` but few parts which canl be readily made and assembled.

Figs. 6, 7, 8 and 9 illustrate the improve ments embodied, in a modified way, in a pump piston or sucker of conventional coni on, including;` the annular valve having` the lower outstanding flange 8, a ring 9 screw-threaded on the valve scat, and an arched spider 10 integral with said ring and having its huh or central portion screw-threaded on the lower end of the pump or sucker rod 11. A valve 12 bears on the seat and is retained within the spider or cage 10, permittingthe liquid 'to flow upwardly throught-he central opening of the piston or plunger when Same is moved downwardly. Such construction is of the conventional form, and a leather. rubber or similar packer is usually clamped between the flange 8 and ring 9', to pre vent leakage between the Ypiston and cylinder. However, in embodying the improve ments in such a piston, a metal packer 13 is used, which is oi' substantially the same shape as the ordinary cup packer of leather, rubber or similar flexible material, whereas the packer 13 is of lead, aluminum or' other suitable metal or alloy. The packer 13 comprises the cylindrical portion or rim 11i surrounding' the ring` 9 and spider 10 and fitting` the inner surface of the pump cylinder, and an inturned flange 15 at the lower edge of the portion '14 disposed botween the flange 8 and ring 9 to assembly the packer with the body of the piston.

The packer 13 is split or Ydivided into two sections, and the division or split is disposed in an oblique or inclined plane intersecting; the axis of the pistou and p acireaintern'icdiate the edges of the portion 1l. and arranged at an acute angle with su artis, a at 1.6. rlhe packer is thus divided into two sections 12 and 21, corresponding; to the sectionsV 12 and'21of the first form hereinbefore describedYI with the ends of the sections inclined to abut in overlapping relation. The portion of the'flanpje 15 carried by the section 21 is thicker than the portion of such flange carried by the section 12, whereby the portion of the flange 15 of the section 21 can be clamped tightlyrbetween the flange 8 and ring 9 of the piston or plunger, to make the section 21 rigid with the rod 11, the same as in the ffirst form, while the portion of the flange 15 carried by the section 12" being thinner yis loose between the flange 8 and ring 9Y to kpermit of limited longitudinalV orvertical movement of the'section 12". wherebyY it acts, in a modified manner. similar to the valve section 12 of' the first form. Thus, when the `piston is moved lll/l downwardly, the section lo can move upwardl.v relatively to the section 2l. oi the packer, the rinO 9 serving as a stop, similar to the stop li), for limiting the upward displacement of the section l2, and the section l2 being removable slightly from the wall oit the cylinder, to constitute a secondary valve. lVhen the piston is moved upwardly, the section l2 will wedge down between the inclined ends ot the section 2l and the wall of the cylinder, there being` a cam action between the sections of the packer, whereby the ends of the pacler are itted tight together, and the packer sections i'itted against the cylinder wall, to prevent leakage between the piston and cylinder wall. The construction and operation of the packer 13 are therefore somewhat the same as the Construction and operation of the piston shown in Figs. 1 to 5, inclusive, the packer 13 being. such that it can be used with the ordinary piston or plunger. By the use ot' the packer 13', the advantages ot the present invention can be incorporated in the pump pistons or plungers now in use. or, such pistons or plungers can be replaced by the device first described herein.

Having thus described the invention, what is claimed as new is zl l. A piston having a cylindrical packer portion divided in a single oblique plane into two sections, one of which is loose to be displaced relatively to the other section when the piston is moved in one direction and to have a wedge fit between the last named section and cylinder wall when the piston is moved in the opposite direction.

2. A piston having a. cylindrical packer portion divided in an oblique plane into two sections, one section being rigid with the piston proper and the other section having limited longitudinal movement relatively to the first named section, the ends oi' the sections being adapted to abut in overlapping relation to separate the sections by cam action when the piston is moved in one direction.

3. A piston divided in a single oblique plane into two sections and adapted to abut in such plane for separating the sections by cam action when the piston is moved in one direction.

4. A piston divided in an oblique plane into two sections, and a rod secured to one of said sections, the other section having a limited longitudinal movement relatively to the firstnamed section and rod, and the sections having a cam action between them for separating the sections when the piston is moved in one direction.

5. A pistoncomposed ot sections having cam surfaces to abut for separating the sections when the piston is moved in one direction, a rod secured to one of said sections, and a stop carried by the rod orlimiting the movement of the other section relatively to the aforesaid section.

6. A piston divided in an oblique plane into two sections, a rod secured to one ot' said sections, the other section having a longitudinal movement relatively to said section, and the sections having a cam action between them for separating the sections when the piston is moved in one direction, and a stop carried by said rod for limiting thel displacement of the second named section relatively to the lirstnamed section.

7. A piston having a cylindrical packer portion, said piston, including the packer portion, being divided in an oblique plane into two sections so that the sections have a cam action between them for separating the sections, when the piston is moved in one direction, so that said packer portion fits the cylinder wall, a rod secured to one of said sections, and a stop secured on said rod within said packer portion for limiting the longitudinal movement of the other section relatively to the iirstnamed section.

In testimonyl whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SANFORD E. CLINE. lVitnesses:

JOHN E. OSBORN, DAVE T. HOLMES. 

